EP0166109B1 - Multipart piston for an internal-combustion engine - Google Patents

Multipart piston for an internal-combustion engine Download PDF

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Publication number
EP0166109B1
EP0166109B1 EP85105072A EP85105072A EP0166109B1 EP 0166109 B1 EP0166109 B1 EP 0166109B1 EP 85105072 A EP85105072 A EP 85105072A EP 85105072 A EP85105072 A EP 85105072A EP 0166109 B1 EP0166109 B1 EP 0166109B1
Authority
EP
European Patent Office
Prior art keywords
piston
screws
annular
annular faces
faces
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85105072A
Other languages
German (de)
French (fr)
Other versions
EP0166109A2 (en
EP0166109A3 (en
Inventor
Alois Barth
Lothar Wiemann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle GmbH
Original Assignee
Mahle GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mahle GmbH filed Critical Mahle GmbH
Publication of EP0166109A2 publication Critical patent/EP0166109A2/en
Publication of EP0166109A3 publication Critical patent/EP0166109A3/en
Application granted granted Critical
Publication of EP0166109B1 publication Critical patent/EP0166109B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F02F3/0023—Multi-part pistons the parts being bolted or screwed together

Definitions

  • a piston of the generic type is known from DE-AS 12 69 414 and DE-OS 28 21 176.
  • the radially inclined support in the inner ring support between the piston crown and lower piston part serves to protect the screws from bending stress when the piston is warm from operation in the known version.
  • the base is already braced against the lower piston part to such an extent that the gap disappears or becomes smaller.
  • the preload is relieved only in the radially inner area of the ring support and not to an inclined position of the piston crown contact area, which would cause the undesirable bending stress of the screws.
  • the piston consists of an upper part 1 and a lower part 2, which are connected by screws 3.
  • the illustration of the piston shows this with assembled but not yet tightened screws 3.
  • these are slightly curved in the lower part 2 in the circumferential direction of the ring surface with the zenith of the curvature 6 exactly in one area in the Middle of two adjacent screws 3.
  • the screw bore 7 itself is additionally arranged in a depression 5 in the annular surface 4 of the lower part 2.
  • the upper and lower parts 1, 2 are clamped to one another via the screws in such a way that the annular surfaces 4 of the two parts 1, 2 lie on one another without gaps over the entire circumference.
  • the material is pre-stressed in the curved sections of the ring surfaces, which guarantees a safe system for all operating conditions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

Die Erfindung betrifft einen mehrteiligen Tauchkolben für Verbrennungsmotoren nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a multi-part plunger for internal combustion engines according to the preamble of claim 1.

Ein Kolben der gattungsgemäßen Art ist aus DE-AS 12 69 414 und DE-OS 28 21 176 bekannt.A piston of the generic type is known from DE-AS 12 69 414 and DE-OS 28 21 176.

Die radial schräge Auflage in der inneren Ringabstützung zwischen Kolbenboden und Kolbenunterteil .dient bei der bekannten Ausführung dazu, die Schrauben vor einer Biegebeanspruchung bei betriebswarmem Kolben zu schützen. Allein zu diesem Zweck ist der Boden im kalten Zustand des Kolbens bereits soweit gegenüber dem Kolbenunterteil verspannt, daß der Spalt verschwindet bzw. kleiner wird. Bei Aufwölbung des Kolbenbodens bei Motorbetriebswärme kommt es dann lediglich im radial inneren Bereich der Ringabstützung zu einer Entlastung der Vorspannung und nicht zu einer Schrägstellung des Auflagebereichs des Kolbenbodens, die die unerwünschte Biegebeanspruchung der Schrauben bewirken würde.The radially inclined support in the inner ring support between the piston crown and lower piston part serves to protect the screws from bending stress when the piston is warm from operation in the known version. For this purpose alone, in the cold state of the piston, the base is already braced against the lower piston part to such an extent that the gap disappears or becomes smaller. When the piston crown bulges during engine operating heat, the preload is relieved only in the radially inner area of the ring support and not to an inclined position of the piston crown contact area, which would cause the undesirable bending stress of the screws.

Trotz der Vorspannung im radial innen liegenden Bereich der Ringabstützung zwischen Kolbenboden und Kolbenunterteil kann es in Fällen, in denen Kolbenober- und -unterteil nur mit relativ wenigen Schrauben verbunden sind, wie z. B. mit vier Schrauben bei einem Kolbendurchmesser oberhalb 200 mm, in der Praxis vorkommen, daß sich die Ringflächen unter den im Motorbetrieb herrschenden thermischen und mechanischen Beanspruchungen leicht voneinander abheben. Dies führt dann zu erhöhten Pressungen in den Bereichen, die nur noch aufeinander aufliegen, mit der Folge, daß dort die materialmäßig zulässigen Höchstbelastungen überschritten werden. Desweiteren kann es in den Bereichen, in denen sich die Ringflächen leicht voneinander abheben, zu Kavitationsbildung kommen.Despite the preload in the radially inner area of the ring support between the piston crown and piston lower part, it can in cases where the piston upper and lower parts are connected with relatively few screws, such as. B. with four screws with a piston diameter above 200 mm, occur in practice that the annular surfaces stand out slightly from each other under the thermal and mechanical stresses prevailing in engine operation. This then leads to increased pressures in the areas which are only in contact with one another, with the result that the materially permissible maximum loads are exceeded there. Furthermore, cavitation can occur in the areas in which the ring surfaces stand out slightly from one another.

Es ist daher Aufgabe der Erfindung, einen gattungsgemäßen Kolben so weiterzubilden, daß bei allen Betriebszuständen des Verbrennungsmotors eine sichere Anlage der gegeneinander verspannten Kolbenober- und Kolbenunterteile gewährleistet ist.It is therefore an object of the invention to develop a generic piston in such a way that, in all operating states of the internal combustion engine, a secure bearing of the piston upper and lower piston parts braced against one another is ensured.

Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale des Anspruchs 1.This object is achieved by the characterizing features of claim 1.

Zweckmäßige Ausgestaltungen sind in den Unteransprüchen enthalten.Appropriate configurations are contained in the subclaims.

Ein Ausführungsbeispiel ist in der Zeichnung dargestellt. Diese zeigt einen mehrteiligen Kolben im Schnitt.An embodiment is shown in the drawing. This shows a multi-part piston in section.

Der Kolben besteht aus einem Oberteil 1 und einem Unterteil 2, die über Schrauben 3 miteinander verbunden sind. Die Darstellung des Kolbens zeigt diesen mit montierten, aber noch nicht fest angezogenen Schrauben 3. In den Bereichen der Ringflächen 4 zwischen den Schrauben sind diese bei dem Unterteil 2 leicht in Umfangsrichtung der Ringfläche gewölbt mit dem Zenit der Wölbung 6 genau in einem Bereich in der Mitte zweier benachbarter Schrauben 3. Die Schrauben - Bohrung 7 selbst ist in der Ringfläche 4 des Unterteils 2 zusätzlich noch in einer Senke 5 angeordnet.The piston consists of an upper part 1 and a lower part 2, which are connected by screws 3. The illustration of the piston shows this with assembled but not yet tightened screws 3. In the areas of the ring surfaces 4 between the screws, these are slightly curved in the lower part 2 in the circumferential direction of the ring surface with the zenith of the curvature 6 exactly in one area in the Middle of two adjacent screws 3. The screw bore 7 itself is additionally arranged in a depression 5 in the annular surface 4 of the lower part 2.

Bei dem fertig montierten Kolben sind Ober-und Unterteil 1, 2 derart über die Schrauben miteinander verspannt, daß die Ringflächen 4 der beiden Teile 1, 2 auf dem gesamten Umfang spaltlos aufeinanderliegen. In den gewölbten Abschnitten der Ringflächen steht das Material dadurch unter einer entsprechenden Vorspannung, die eine sichere Anlage für alle Betriebszustände garantiert.In the fully assembled piston, the upper and lower parts 1, 2 are clamped to one another via the screws in such a way that the annular surfaces 4 of the two parts 1, 2 lie on one another without gaps over the entire circumference. As a result, the material is pre-stressed in the curved sections of the ring surfaces, which guarantees a safe system for all operating conditions.

Claims (4)

1. A multi-part piston for internal combustion engines with a lower piston part (2) .and an upper piston part (1) holding the piston pin, these parts (1, 2) being capable of being clamped on one another by an annular ridge formed on each part (1, 2) with an annular face (4) lying substantially transversely to the piston axis and against one another by screws (3) guided through these annular faces, characterised in that, in the unclamped state, at least one of the mating annular faces (4) bulges in the peripheral direction toward the other, axially adjacent annular face (4) in the regions running between the screws (3) in such a way that the annular faces (4) make contact merely in said regions.
2. A multi-part piston according to claim 1, characterised in that, in the unclamped state, the axial distance between the opposing annular faces (4) increases from a respective region lying in the centre between two screws (3) towards the screws (3).
3. A piston according to claim 1 or 2, characterised in that the peripheral bulge (6) is the same over the radial extension of the annular faces (4).
4. A piston according to one of the preceding claims, characterised in that the passages (7) for the screws (3) are each formed in a depression (5) extending to the radial edges of the annular faces (4).
EP85105072A 1984-06-27 1985-04-26 Multipart piston for an internal-combustion engine Expired EP0166109B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3423559 1984-06-27
DE3423559A DE3423559C1 (en) 1984-06-27 1984-06-27 Multi-part plunger for internal combustion engines

Publications (3)

Publication Number Publication Date
EP0166109A2 EP0166109A2 (en) 1986-01-02
EP0166109A3 EP0166109A3 (en) 1986-12-30
EP0166109B1 true EP0166109B1 (en) 1989-04-26

Family

ID=6239195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85105072A Expired EP0166109B1 (en) 1984-06-27 1985-04-26 Multipart piston for an internal-combustion engine

Country Status (4)

Country Link
US (1) US4603617A (en)
EP (1) EP0166109B1 (en)
JP (1) JPH0660595B2 (en)
DE (1) DE3423559C1 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3540085A1 (en) * 1985-11-12 1987-05-14 Alcan Aluminiumwerke PISTON FOR INTERNAL COMBUSTION ENGINES
BR9001859A (en) * 1990-04-17 1991-11-12 Metal Leve Sa EMBOLO AND EMBOLO MANUFACTURING PROCESS
BR9001916A (en) * 1990-04-20 1991-11-12 Metal Leve Sa PROCESS OF OBTAINING REFRIGERATED PUMP AND REFRIGERATED PUMP
US5092290A (en) * 1990-09-13 1992-03-03 Navistar International Transportation Corp. Engine piston assembly with planar pin mounting surface
BR9005376A (en) * 1990-10-18 1992-06-16 Metal Leve Sa BIPARTITE EMBULE WITH POSTIC GALLERY CLOSING AND PROCESS FOR YOUR OBTAINING
US5499572A (en) * 1993-08-26 1996-03-19 Cobble; Daniel L. Bi-tech piston
DE19642109A1 (en) * 1996-10-12 1998-04-16 Mahle Gmbh Built piston
DE19721013A1 (en) * 1997-05-20 1998-12-03 Mahle Gmbh Bolt arrangement with the piston built
US6182630B1 (en) 1998-11-23 2001-02-06 Federal-Mogul World Wide, Inc. Bolted articulated piston
GB2384541A (en) * 2002-01-25 2003-07-30 Federal Mogul Bradford Ltd Piston with gap between crown and body portion to allow for heat expansion
US7100480B2 (en) * 2003-04-02 2006-09-05 Irwin Industrial Tool Company Quick adjusting pliers
DE102007019931A1 (en) * 2007-04-27 2008-10-30 Mahle International Gmbh Method for screwing two metal parts

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1269414B (en) * 1966-06-15 1968-05-30 Mahle Kg Internal combustion engine piston with base plate

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2165619A (en) * 1937-07-10 1939-07-11 Nash Kelvinator Corp Piston
US3029112A (en) * 1959-02-02 1962-04-10 Napier & Son Ltd Composite structures, particularly composite pistons
US3960048A (en) * 1975-03-28 1976-06-01 Illinois Tool Works Inc. Fastener assembly for creating accurate tension indicating fastener and method of calibrating the same
DE2821176C2 (en) * 1978-05-13 1982-12-09 Mahle Gmbh, 7000 Stuttgart Piston with base plate for internal combustion engine
DE2832970A1 (en) * 1978-07-27 1980-02-07 Schmidt Gmbh Karl BUILT LIQUID-COOLED PISTON FOR INTERNAL COMBUSTION ENGINES
JPS5831464B2 (en) * 1980-04-30 1983-07-06 川崎重工業株式会社 Internal combustion engine piston structure
JPS5744814A (en) * 1980-08-31 1982-03-13 Fujitsu Ltd Waveform regulating circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1269414B (en) * 1966-06-15 1968-05-30 Mahle Kg Internal combustion engine piston with base plate

Also Published As

Publication number Publication date
JPH0660595B2 (en) 1994-08-10
EP0166109A2 (en) 1986-01-02
US4603617A (en) 1986-08-05
EP0166109A3 (en) 1986-12-30
DE3423559C1 (en) 1985-09-26
JPS6116251A (en) 1986-01-24

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